The Long Āgama Sūtra 7.72

7.72

迦葉語婆羅門：「吾今問汝，隨意答我。如人稱鐵，先冷稱已，然後熱稱，何有光色柔輭而輕？何無光色堅䩕而重？」

Kāśyapa said to the priest, “Now, I’ll ask you a question and you tell me what you think. Suppose someone weighs iron. First, they weigh it while it’s cold, and later they weigh it while it’s hot. When would it be glowing with color, flexible, and lighter? When would it not be glowing, solid, and heavier?”